Yes, but no. Previously mail was postmarked locally because it was processed locally. Now they have gotten rid of local processing and it all gets first processed at a regional hub. However you could always have it postmarked at the desk to be absolutely sure it happens on the day you mailed it.
So you can still ask for a manual postmark at the office you drop it off at and it will override whatever date it gets regionally processed.
I thought this change is that the date is marked by a regional processing machine, instead of at the local post office?
Yes, but no. Previously mail was postmarked locally because it was processed locally. Now they have gotten rid of local processing and it all gets first processed at a regional hub. However you could always have it postmarked at the desk to be absolutely sure it happens on the day you mailed it.
So you can still ask for a manual postmark at the office you drop it off at and it will override whatever date it gets regionally processed.